Brick-machine



(No Model.) I

D. S. PLUMMER. BRIGK MAGHINE.

No. 452,648. Patented May 19, 1891.

UNITED STATES ATENT OFFICE.

DAVID S. PLIIMMER, OF BOSTON, MASSACHUSETTS.

BRICK-MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 452,648, dated May 19, 1891. Application filed April 24:, 1890. Renewed April 18, 1891- Serial No. 3539, 152- (No model.)

To all whom, it may concern.-

Be it known that I, DAVID S. PLUMMER, of Boston,in the county of Suffolk and Commonwealth of Massachusetts, have invented certain Improvements in Brick Making Machines, of which the following, taken in connection with the accompanying drawings, is a specification.

This invention relates to machines employed for making bricks, and to that class of such machines wherein a revoluble mold-ta ble is used in combination with compressingplungers, and more specifically this invention appertains to the mechanism for revolving the mold-table intermittently.

The nature of the invention is fully desrfi'ibed, and then specifically claimed hereina er. This my invention as shown in the present instance is combined with the revolving moldtable usually employed in what is known in the trade as the Gregg brick-machine, and so much. only of the machine is represented as to illustrate my invent-ion and its use combined with such a machine.

In the drawings, Figure 1 is a plan View representing the mold-table and my improved mechanism for rotating the same. Fig. 2 is a sectional plan representing the mechanism disengaged from the mold-table. Fig. 3 is a cross-section on line 3 3 of Fig. 2.

The mold-table A is provided with moldchambers a for receiving the brick-clay and holding it While compressed by plungers, (not shown,) which plungers to that end enter the mold-chambers a from opposite sides, or instead one plunger may be used for compressing the clay against the fixed stop-plate.

The construction and arrangement. of the mold-table, the said plungers, and other cooperating mechanisms are not specifically described herein; but for a knowledge thereof reference is had to Letters Patent of the United States N 0. 354,129, and other Letters Patent of the United States issued to \Villiani L. Gregg for improvements in brick-machines.

Heretofore a segment-gear has been used for rotating intermittently the mold-table A. To that end the said gear has been arranged to mesh with gear-teeth arranged on the periphery of the mold-table A and revolved continuously, so as to engage and disengage the mold-table at intervals.

mold-chamber at one point while the mold-table is resting. The next movement of the mold-table brings the filled chambers to a point directly in line with the plungers, at which place the table rests, while the plungers enter said chambers to compress the clay. The next movement of the tableA brings the said chambers to a point where the bricks are ejected. It will be understood that the compressing-plungers necessarily fit quite closely the mold-chambers, and it becomes necessary for the mold-table to move and stop with precision and uniformly in registration with the compressing-plungers.

In practice I have found great difficulty arising when asegment-gear is used for rotating the mold-table. The gear does not leave the mold-table uniformly in position with the mold-chambers in registration with the compressing-phingersthat'is to say, the movements imparted to the mold-table by a segment-gear are not uniformly equal-and to provide a mechanism for rotating the moldtable with uniform regularity of movements, and thus to insure uniform alignment between the mold-chambers and plungers constitutes the object of my present invention. To that end I engage the mold-table intermittently by a rack B, Said rack is provided with teeth to engage the teeth of the mold-table for moving the table, as in Fig. 1.. The rack is chambered to receive a suitable tongue 6, Fig. 3, on which the rack is permitted a longitudinal sliding movement. The tongue is formed integral with the block f, andthis block is movably supported on the framework H, so that it, together with the rack, may be moved to and from the mold-table to make the said rack engage and disengage the teeth of the mold-table, as shown re spectively in Figs. 1 and 2. This movement of block f toward and from the mold-table is imparted from the revolving gear-wheel N, through the lever 01 and toggles m, to which end the toggles are engaged, one end with frame H and one end with block f, to permit which latter connection the toggles are provided with anti-friction wheels that set into In operation the clay is received in the oblong ehambers in the block, as shown. The lover a has in its rear end a pin that engages in a cam-groove 71, formed in gear-wheel X. Said wheel carries a crank-arm P, that engages, as shown, the pitman In operation the wheel N is revolved as indicated by arrow. Obviously each complete revolution of said wheel N rcciproeates the rack 1% forward and backward one movement in each direction. The motion is imparted through the arm I and pitman S. As the rack reaches its extreme limit of movement in one direction it is disengaged from the moldtable by bending of the toggle-arms m, which movement is effected through the pitman n by the cam 71.. Said toggles are held by the cam in such manner as to continue the disengagement of the rack and mold-table during the entire longitudinal movementof said rack in one direction. Said cam then operates through the lever n to straighten the toggles m, and thereby to set the rack into engagementwith the mold-table, where it is retained by the action of said cam during the entire obverse longitudinal movement of the rack. It is during this movement that the partial rotation of the mold-table is effected. This device insures a positively uniform movement of the mold-table.

In the drawings I have represented gears l- 5 6 combined with gear-wheel N. This system of gears is introduced, as it affords a eonvenient way of connecting my mechanism with the shaft 8, which is the driving-gcar of a Gregg machine, and it allows my mechanism to be set away from other interfering parts of the machine. I would not, however,

be understood as stating this system of gears to be an essential part of my invention.

I have described my invention as applicaemcee ble to these-called Grcggmachine, butmeehanics of ordinary skill would have no difficulty in applying it to other brick-machines wherein a rcvolnblc mold-table is employed.

I have represented the mold-table as provided on its periphery with gear-teeth to engage teeth on the rack 13; butinstead of such teeth pins or other obvious engaging devices might be used without departing from the spirit of my invention. The arm Pis set upon the wheel Nadj ustably by means of pins and clamp-nuts, as shown, to permit adjustment of thearm for varying the length of movement longitudinally imparted to rack 13.

\Vhat I claim is 1. In combination, a revoluble mold-table having mold-chambers a and tooth projections, a rack to engage said teeth, said rack being supported to have reciprocating movement and movement to and from the moldtable, means for reciprocating the rack, and means for moving it to and from the table, substantially as described.

2. In a brick-machine, the mold-table A, having tooth projections, and a tooth-rack I), supported movably on bloekf, the toggles m, wheel N, and intermediate pitman 'n, substantially as described.

3. In a brick-machine, in combination with a mold-table having tooth projections, a toothrack and operating mechanisms consisting of toggles m, cam-wheel N, intermediate pitman n, and levers l S, all arranged substantially as set forth.

Signed at Boston, Massachusetts, this 16th- 

